Statistics students in Oxnard College sampled 9 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below: Number of Pages (xx) Cost(yy) 645 69.15 539 54.73 386 49.02 744 66.08 509 45.63 677 60.39 866 70.62 659 58.13 603 58.21 A student calculates a linear model yy =  xx + . (Please show your answers to two decimal places) Use the model to estimate the cost when number of pages is 516. Cost = $ (Please show your answer to 2 decimal places.)

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